- Tran-Son-Tay, R. and Coffey, B.E. and Hochmuth, R.M., The motion of a ball oscillating in a bounded fluid: inertial and wall effects,
J. Rheol. (USA), vol. 34 no. 2
pp. 169 - 91 [1.550122] .
(last updated on 2007/04/10)
Inertial and wall effects on the motion of a ball oscillating in a rigid container are investigated both experimentally and theoretically. Experiments are performed with an oscillating ball rheometer to determine the effects of inertia and of the wall on the motion of a rigid sphere oscillating within a Newtonian fluid in a vertically oriented cylindrical tube. It is found that under certain conditions the effect of inertia on the drag force acting on a ball oscillating inside a cylindrical tube is well described by the theory for a ball oscillating inside a spherical container. When the imaginary component of the total hydrodynamic force is negligible, this result allows a correction and the use of the Stokes drag equation to account for the boundary and frequency effects in the determination of the non-Newtonian viscosity with a ball rheometer
drag;elastic moduli;external flows;fluid mechanics;non-Newtonian fluids;suspensions;two-phase flow;viscoelasticity;